Abstract
A pilot-scale six-compartment hybrid anaerobic baffled reactor (HABR) with effective volume of 18 m3 was used to treat dyeing wastewater. The HABR system was able to treat the wastewater efficiently after FeSO4 pretreatment, as indicated by removal efficiencies of 33.7% for chemical oxygen demand (COD), 39.9% for suspended solid (SS), and 22.5% for sulfate (SO42−) during steadily operational period. Gas chromatography–mass spectrometry (GC-MS) showed that the concentrations of alkanes, amides, organic acids, ketones, phenols, and esters were much lower in the effluent than those in the influent; many high-molecular-weight compounds such as cyclanes, quinolines, and phenols were successfully transformed to low-molecular-weight ones. As illustrated from the results of generalized grey relational analysis (GGRA), COD removal efficiency was more closely associated with flow rate, organic loading rate (OLR), water temperature, and influent SS among the whole selected possible factors. Based on the overall treating effectiveness and the GGRA study, the optimized operation strategy of the dyeing wastewater treatment by HABR was obtained as the hydraulic retention time (HRT) of 12 h for steady-state operation with an up-flow velocity of 1.7 m/h as well as OLR of 1.5–2.0 kg COD/(m3·d).
Highlights
Around 50,000 metric tons of synthetic dyes are discharged with wastewater worldwide every year [1,2]
The Chemical Oxygen Demand (COD) removal of this pilot scale hybrid anaerobic baffled reactor (HABR) during operational period of 131 days is shown in revealed good COD degradation performance
Thewith results showed that flow rate, organic loading rate (OLR), influent suspended solid (SS), and water temperature revealed strong correlation with COD removal effect
Summary
Around 50,000 metric tons of synthetic dyes are discharged with wastewater worldwide every year [1,2]. Dyeing wastewater is characterized by high pH, deep color, strong toxicity, various components, and wide range of water quality and amount variation [3,4]. Dyeing wastewater is commonly treated by economic and effective biochemical methods. The recalcitrant nature of azo dyes, together with their toxicity to microorganisms, makes aerobic treatment difficult to meet the discharge criterion. Recent studies on dyeing wastewater treatment by pilot-scale
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